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SEGMENT INFORMATION - Expenses (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Segment information |  |  |  |
Stock-based compensation expense | $ 19.5 | $ 16.0 | $ 53.0 | $ 46.9
Corporate and unallocated |  |  |  |
Segment information |  |  |  |
Payroll costs | 61.7 | 50.1 | 173.5 | 151.0
Stock-based compensation expense | 19.2 | 16.0 | 52.7 | 46.9
Professional service expenses | 16.7 | 13.3 | 50.1 | 49.2
Other operating expenses | $ 11.6 | $ 11.1 | $ 35.5 | $ 35.3

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